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Finding the Fourth Proportional to 703.12, 1,055.08 and 390.80

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Solution

The fourth proportional to 703.12, 1,055.08 and 390.80 is: 586.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.12 : 1,055.08 = 390.80 : x
  2. Step 2: Convert to fraction form
    703.12/1,055.08 = 390.80/x
  3. Step 3: Cross multiply
    703.12x = 1,055.08 × 390.80
  4. Step 4: Simplify right side
    703.12x = 412,325.26
  5. Step 5: Solve for x
    x = 412,325.26/703.12
  6. Step 6: Final answer
    x = 586.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.